Strainer.



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STRiltINER/i Speccation of Letters Patent. i

` application filed February 16, 191e. Serial No. 921%',936.

To all cowmz't may concern."

it ,known that L HANS Bierman Hana rrr.. aeuhject of the Emperor ofGermany, anda` resident of Franklin, in the county of llltirlfoll: andState of Massachusetts, have i invented certain new and usefullinproveineiits in Strainer-s, of which the JfollowingI is 1 anydecrease in the tensile strength and llti elasticity of the material.

ill .further ologect et the invention is 'the provision of meanswhereloy lumps in the material may loe broken up or removed and in thismanner cause the material to he uni-` forni,

The invei'ition consists of a head which may he attached to or termedupon any existing 4torni of straining' or tubing machine, and 'whichprovided with a cone-shaped strainer olf line mesh superimposed upon acond-shaped support removable from and adjustalile .in the deliveryopening of said head.,

,i 'lhe invention further consists of serrating the Wall of the deliveryopening there- V'hv hrealring up the lumps passing through rl opening,and, retardinp; the outer por f tion ollhe material as it passes betweensaid serrated wall and the cone screen.

The invention jliurther consists in providingr means whereby theunstrained portion olE thc inaterlal may he collected and 'forced tionone preferred torni tliereot' is lillustrated he purpose etillustrating; the invenin the drawings, this form having been found togive satisfactory and reliable results, although 1t is to hev understoodthat `the various instrumentalit-ies of Which-the invention consists canbe variously arranged and organized and the invention is not limited tothe precise arrangement and organiza@` tion of these-instrumentalitiesas herein shown and described, except as required by the scope ot theappended claims. 0f the drawings: c

Figure 1 represents a section ,of a strainer head embodying liepl'inciplesot' the present` invention, and y y Fig. represents an endelevation of the saine With the cone shaped strainer audits supportremoved from the discharge open-` ing.

Similar characters designate `like y parts throughout the severalyfigures ol the drawings. i y

ln. the drawings is a cylinder for'rn'ing a part `oit astrainingfmachine adapted to strainplastic material such, for instance,as rubber.

Vlithin the cylinder l0 is a revoluble shaft 11 having 'formed thereonor secured thereto a screw 12 adapted to force the` plastic material'vaithin said cylinderlO tovvard the discharge end of said cylinder.

This discharge end of the Vcylinder is provided with an annular chamber13 to Which a temperature regula-ting medium may be admitted throughthe'lpipe 14.A

The inner Wall 15 of the discharge opening is inclined invvardly7 andtoward the'outer end of the cylinder 10 thereby'lliorming a contractedmouth 16 from which the Wall Flares outwardly as shovvn in Fig. 1Q iThis outwardly flaring' portion of the wall 15 is provided with aplurality ofannular grooves 17 having shoulders facing the ,contractedmouth 16.

rl`hreaded tothe outer end of the cylinder l() is a closure 18 with a`shoulder 19thereon hearing against the end tace offsaidv cylinder. y

lnto the closure 18is threaded a tubular inernber 20 the inner end Q1otyvvhich is cone-shaped and provided with a plurality of largeperlorations. l

leinovahly mounted 'upon fsaid conesliaped end 2l is a cone-shapedscreen 23 hot tine mesh which may be' removed when dc- Patented -Dec.3.; luth..

sired in order to clean the same or in order to replace it 4with anotherscreen of a different mesh, it being obvious that for differentmaterials different screens are desirable, and even for the samematerial under different conditions.

The outer wallfof the cone-shaped `end 21 is preferably substantiallyvparallel with the serrated or grooved wall portion of the dis-- der 10.

The plastic material may'be delivered to the interior of the cylinder111 any well known manner and by means of the rev- -olublescrew 12 thisstock is forced through the contracted mouth 16 into the annular passage24 between the water cooled chamber 13 and the fine meshed screen 23 onthe cone-shaped support 21.

The size of the annular passage 24 may be varied by-rotating the tubularmember 20 by means of the head 31 thereby moving the cone-shaped end 21inwardly or outwardly as desired. As the material passes through thepassage 24 the outer portionsy thereof will'be retarded by the shouldersof the grooves 17 while that portionA of the stock ynext to the screenwill be moved faster.

This results in the cooling medium in the chamber 13 strengthening theouter portion of the material while the inner portion thereof next thescreen 23 will retain its puttyflike consistency.

AsaI consequence of this unequal forward movcn'lent of the material dueto one portion thereof being retarded in its movement whilel the innerportion moves lunch faster than theI retarded portion, any lumps thatthere may be in the stock are torn apart ami-broken up while at the sametime all impurities on the screen 23 are pushed forward and ott' saidscreen thus automatically cleaning said screen.

All impurities and lumps will pass the entire length of the annularpassage 24 into `the frroove or chanibcr 25 from whichthev may beconveyed through the pipes 27. 2%) and 30 into the interior of thecylinder 10. The valves 28 are adapted to regulate the passage ofthomaterial returning tothe cylinder.

By raising the temperature of the medium 'in the chamber 13, the lumpswill not be broken up, but will be forced out from the passage 2l withthe impurities and can be collected for separate treatment.

Heretofore the plastic material has been forced through the screen in adirection perpendicular to said screen and the screen cone-shapedsupport 21 to be' finally discharged through the tubular member 20 whilethe impurities and lumps will be car ried down the surface of the coneinto the overflow pipes as heretofore described.

rl`his makes a most edective strainer the screen of which will beautomatically cleaned by the material as it is forced out-vr wardlythrough the annular passage .24.

The screens may be quickly changed thereby preventing the loss of timewhich has formerly been incurred in other styles of strainers.

Byv giving the line mesh screen a rigid perforated backing the breakingof or injury to the screens is etfectually overcome.

Where the material is forced directly toward a. screen disposedtransversely of the path ofmovement of the material, said material isliable to be Ichurned and overheated thereby causing an enormousdecrease of tensile strength and elasticity in the rubber. Theseobjections are wholly obviated when the device herein shown anddescribed is used.

By providing a means for breaking up or removing of all lumps from thematerial, the material is more uniform and the tensile strength andelasticity thereof is greatly increased.` It is believed that theoperation of the invention and its many advantages will be thoroughlyyunderstood without further description.

Having thus described my invention, Il

claim: l

1. In a device of the class described, a discharge tube having acontracted passage terminating in a flaring conical mouth, the wall ofwhich is provided with a plurality of annulai` seri-ations; means forforcing plastic material into said tube; and a cone-shaped screenpositioned in the mouth of said tube.

2. In a device of the class described, a discharge tube having acontracted passage terminatingin a flarmg conical mouth the wall ofwhich is provided With a plurality of annular material-retardingshoulders; means for forcing plastic material into said tube; and aCone-shaped screen positioned in the mouth of said tube.

3. 1n a device of the class described, a disnaamw charge tube. having anoutwardly flaring cone-shaped mouth; mans for vt'orcing plastielmaterial into said tube; a hollow cone-shaped support in said mouthremoved and disconnected from said forcing means' and provided withplurality otl perforations through its wall7 the outer tace of which issubstantial] f parallel with, but Separated trom the wall ot' saidcone-shaped mouth; and a removableA cone o n said support o'pen only atone end and having a plurality ot' perfor-ations therein smaller thanthose in said support. 1

L ln a device ot' the-elass described; a discharge tube having anoutwardly flaring cone-shapial mouth surrounded by a chamber adapted'tocontain a ten'iperature regu*v lating medium; means for forcing plasticmaterial into said tube; a hollow cone-shaped support in said mouthhaving a clear passage from its peak to its open outer end and providedwith a )lurality of pert'oi'ations through its wall, tlie outer t'aceot' which is substantially parallel with but separated from the wall olsaid cone-shaped mouth; and a removable cone on said support haw ing aplurality ot' pertorations therein smaller than those in said supportadapted to be removed endwise from said support.

5. ln a device ot' the class described, a discharge tube having anoutwardly Haring cone-shaped mouth; means tor4 t'oreing plastic materialinto said mouth; a coneshaped screen in and separated from the wall ot'said mouth by an annular passage; and means outhe wall ot' said moutht'or retarding that portion ot the material adjacent thereto.

(i. In a device of the, class described, a discharge tube having anoutwardly flaring cone-shaped mouth; means't'or forcing plastie materialinto said. mouth; a 'cone-shaped screen in and separated from the wallot' said mouthby an annular passage; means on the wall of said mouth forretarding that portion of the material adaeent thereto; and

titll means .for collecting that portionvof the material passingentirely through said annular passage and returning it to the source otsupply.- i 1 l 7. Ina device of the cla-ss described, a discharge tube;a euri-shaped member threaded thereto and provided with an annularchamber; a. cylindrical member threaded to said cup-shaped member andprovided with a,

perforated cone-shaped end extending into i forcing said material intosaid tube.l

I tube.

S. In a device of the class described, a discharge tube, a @up-shapedmember threaded thereto and provided with an annular chamber; aCylindrical member threaded to said eupshaped member and provided with,al

lperforated cone-shaped end extending into said tube and formingtherewith an annular passage communicating with said chamber;` a systemot' piping eonnnunicating with said ehamber and leading to the source ofsupply; means for regulating the discharge through said system ofpiping; and means for forcing material into said tube. t

9. In a device ot' the class described, a discharge tube; a cup-shapedmember threaded thereto and provided with an annular chamber; acylindrical member threaded to said cup-shaped member and provided withi perforated coneshaped end extending `into said tub and formingtherewith an annular passage communicating with said chamber; an annularpipe surrounding said cupshaped-member; radial pipes leadingl from saidchamber to said annular pipe; apipe leading from said annular pipe. tothe source ot' supply ot' said material; and means for lll@ 1U. ln adevice ot' the class described, a discharge tube; a cup-shaped memberthreaded thereto andy provided with an annular chamber; a eyliudricalmember thread ed to said cup-shaped member and provided with aperforated cone-shaped end extentiing into said tube and formingtherewith au` annular passage communicating with said chamber; anannular pipe surrounding Said cup-shaped member; radial pipes leadingvfrom said chamber to' said annular ipe; a valve in each radial pipe; apipe ending tfrom said annular'pipe to the source of supply oftsaidmaterial; and means for forcing said material into said tube. A

Signed by me at t Post @Hice Sq., Boston Mass. this 6th day of February,1918.

.HANS RO/HARD HAERT 2L.

Witnesses f WALTER E. LOMBARD, I

NATHAN C. LoMAnp.

